You could use the Flair vents with the Ecobee, but it integrates using the Ecobee Internet API, and that is far too flaky and unstable to use as a base for anything, IMHO.
I don't connect my Ecobee to the Hubitat any longer, as I could never trust the data that was seen by Hubitat, so vent control or even temperature setting was infuriatingly unreliable.